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公开(公告)号：US4589051A
公开(公告)日：1986-05-13
申请号：US564539
申请日：1983-12-22
CPC分类号： H05G1/54 , H02H7/1225 , H02M3/337 , H05G1/32
摘要： In an X-ray generator operating with a pulse-width-modulated transistor inverter, circuitry is provided to sense the collector-emitter voltage of each of the transistors and to responsively turn off the transistor when that voltage level reaches a predetermined threshold level which is indicative of a problem. Provision is included to inhibit the operation of the protective circuit during the time period in which the transistor is turning on so as to thereby allow for higher voltages during that critical period.
摘要翻译： 在用脉冲宽度调制晶体管反相器工作的X射线发生器中，提供电路以感测每个晶体管的集电极 - 发射极电压，并且当该电压电平达到预定的阈值电平时响应地关断晶体管， 表明有问题。 包括了在晶体管导通的时间段内禁止保护电路的工作，从而允许在该临界时段期间更高的电压。
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公开(公告)号：US4601051A
公开(公告)日：1986-07-15
申请号：US564603
申请日：1983-12-22
摘要： An inverter receives a d.c. voltage and delivers to an X-ray tube, by way of a high-voltage transformer, filter, and rectifier, a high-voltage d.c. output. The inverter is driven in response to control signals which are responsive to the difference between a voltage demand signal and a voltage feedback signal. The control signals are also responsive to various status conditions of the system which are monitored by a microprocessor. Inputs to the microprocessor include various signals which are indicative of voltage or current conditions. In this way, such conditions as an over-voltage at the output, an unbalance between the anode and cathode with respect to ground, or an excessive current flow are detected and precautionary measures are quickly taken to prevent further damage to the system.
摘要翻译： 逆变器接收直流 电压并通过高压变压器，滤波器和整流器传送到X射线管，高压直流。 输出。 响应于响应于电压需求信号和电压反馈信号之间的差异的控制信号来驱动逆变器。 控制信号还响应于由微处理器监控的系统的各种状态。 微处理器的输入包括指示电压或电流条件的各种信号。 以这种方式，检测出诸如输出端的过电压，阳极和阴极之间的相对于地面的不平衡或过大的电流的条件，并且快速采取预防措施以防止进一步损坏系统。
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公开(公告)号：US4597026A
公开(公告)日：1986-06-24
申请号：US564581
申请日：1983-12-22
CPC分类号： H02M3/3376
摘要： In an X-ray generator system having a pulse-width-modulated transistor inverter with associated flywheel diodes, method and apparatus is provided to sense when a diode associated with a non-pulse-width-modulated transistor is conducting and for inhibiting the turning on of that transistor during such period, to thereby avoid the transition from reverse conduction to direct conduction in an uncontrolled manner.
摘要翻译： 在具有相关联的飞轮二极管的脉宽调制晶体管反相器的X射线发生器系统中，提供了一种方法和装置，用于检测与非脉冲宽度调制晶体管相关联的二极管是否导通，以及用于抑制导通 在这样的时间段期间，从而避免了以不受控制的方式从反向传导转换为直接传导。
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公开(公告)号：US4654770A
公开(公告)日：1987-03-31
申请号：US564622
申请日：1983-12-22
摘要： Current limit protection is provided to ensure that the current flow within the transistor inverter does not exceed a predetermined safe level to thereby cause damage to the various components such as the transistor inverters. The current in the primary of the transformer is sensed and a representative signal is compared with a reference signal to provide a digital output indicating whether a safe limit has been exceeded. A logic network then operates on the output signal to shut down or reduce the system operation accordingly. In the event of a shut-down, current decay is accommodated by shutting off only the top transistors in the inverter diagonals so as to thereby allow the remaining current to flow in the bottom transistors and diodes.
摘要翻译： 提供电流限制保护，以确保晶体管逆变器内的电流不超过预定的安全电平，从而对晶体管逆变器等各种部件造成损坏。 感测变压器的初级电流，并将代表信号与参考信号进行比较，以提供指示是否已经超过安全限值的数字输出。 然后，逻辑网络对输出信号进行操作以相应地关闭或减少系统操作。 在关闭的情况下，通过仅关闭逆变器对角线中的顶部晶体管来容纳电流衰减，从而允许剩余电流流入底部晶体管和二极管。
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